81214407 has 10 divisors (see below), whose sum is σ = 121320408. Its totient is φ = 54142884.

The previous prime is 81214381. The next prime is 81214411. The reversal of 81214407 is 70441218.

It is not a de Polignac number, because 81214407 - 2⁷ = 81214279 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 501243 + ... + 501404.

Almost surely, 2^81214407 is an apocalyptic number.

81214407 is a deficient number, since it is larger than the sum of its proper divisors (40106001).

81214407 is a wasteful number, since it uses less digits than its factorization.

81214407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002659 (or 1002650 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 81214407 is about 9011.9036279801. The cubic root of 81214407 is about 433.0562982053.

The spelling of 81214407 in words is "eighty-one million, two hundred fourteen thousand, four hundred seven".